White, J.C., Urbanczyk, K.M., Watson, K., 2019, The Leyva Canyon Volcano. In: Geology at the Crossroads—Big Bend Ranch State Park, Presidio and Brewster Counties, Texas (P.W. Dickerson, B.R. Hall, and B.B. Hunt, Eds.) Austin Geological Society Guidebook 39, p. 48-58.
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Leyva Canyon volcano is an Oligocene (37.3 to 27.1 Ma) trachyte shield volcano whose eruptive and volcaniclastic deposits of rhyolite and trachyte lavas, ash-flow tuffs, lahars, and associated sedimentary rocks comprise the Leyva Canyon Member of the Rawls Formation. The lavas and tuffs originated from vents located near the present-day "Bofecillos vent" in the central Bofecillos Mountains, approximately 5 km west of the Sauceda Ranger Station in Big Bend Ranch State Park in southernmost Presidio County, Texas. The pyroclastic and volcaniclastic units form the distinctive cliffs and caves at the periphery of the Bofecillos Mountains, with the caves developing in the ash-flow tuffs that underlie the most erosionallu resistant lahars; these units are the focus of this disucssion.
Austin Geological Society Guidebook
Geology at the Crossroads—Big Bend Ranch State Park, Presidio and Brewster Counties, Texas